<template>
  <div class="component-upload-image">
    <el-upload
      ref="imageUpload"
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :before-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit }"
    >
      <el-icon class="avatar-uploader-icon"><plus /></el-icon>
    </el-upload>
    <!-- 上传提示 -->
    <div v-if="showTip" class="el-upload__tip" style="line-height: 1.2">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
      </template>
      的文件
    </div>

    <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto">
    </el-dialog>
  </div>
</template>

<script setup>
  import { getToken } from '@/utils/auth'

  const props = defineProps({
    modelValue: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['png', 'jpg', 'jpeg', 'webp', 'gif']
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    }
  })

  const { proxy } = getCurrentInstance()
  const emit = defineEmits()
  const number = ref(0)
  const uploadList = ref([])
  const dialogImageUrl = ref('')
  const dialogVisible = ref(false)
  const baseUrl = import.meta.env.VITE_GLOB_APP_BASE_API
  const uploadImgUrl = ref(import.meta.env.VITE_GLOB_APP_BASE_API + '/common/upload') // 上传的图片服务器地址
  const headers = ref({ Authorization: 'Bearer ' + getToken() })
  const fileList = ref([])
  const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize))

  watch(
    () => props.modelValue,
    val => {
      if (val) {
        console.log('123', val)
        // 首先将值转为数组
        const list = Array.isArray(val) ? val : props.modelValue.split(',')
        // 然后将数组转为对象数组
        fileList.value = list.map(item => {
          if (typeof item === 'string') {
            if (item.indexOf(baseUrl) === -1) {
              item = { name: item, url: item }
              // item = { name: baseUrl + item, url: baseUrl + item }
            } else {
              item = { name: item, url: item }
            }
          }
          return item
        })
      } else {
        fileList.value = []
        return []
      }
    },
    { deep: true, immediate: true }
  )

  // 上传前loading加载
  function handleBeforeUpload(file) {
    let isImg = false
    if (props.fileType.length) {
      let fileExtension = ''
      if (file.name.lastIndexOf('.') > -1) {
        fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
      }
      isImg = props.fileType.some(type => {
        if (file.type.indexOf(type) > -1) return true
        if (fileExtension && fileExtension.indexOf(type) > -1) return true
        return false
      })
    } else {
      isImg = file.type.indexOf('image') > -1
    }
    if (!isImg) {
      proxy.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}图片格式文件!`)
      return false
    }
    if (props.fileSize) {
      const isLt = file.size / 1024 / 1024 < props.fileSize
      if (!isLt) {
        proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`)
        return false
      }
    }
    proxy.$modal.loading('正在上传图片，请稍候...')
    number.value++
  }

  // 文件个数超出
  function handleExceed() {
    proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`)
  }

  // 上传成功回调
  function handleUploadSuccess(res, file) {
    if (res.code === 200) {
      uploadList.value.push({ name: res.fileName, url: res.url })
      uploadedSuccessfully()
    } else {
      number.value--
      proxy.$modal.closeLoading()
      proxy.$modal.msgError(res.msg)
      proxy.$refs.imageUpload.handleRemove(file)
      uploadedSuccessfully()
    }
  }

  // 删除图片
  function handleDelete(file) {
    const findex = fileList.value.map(f => f.name).indexOf(file.name)
    if (findex > -1 && uploadList.value.length === number.value) {
      fileList.value.splice(findex, 1)
      emit('update:modelValue', listToString(fileList.value))
      return false
    }
  }

  // 上传结束处理
  function uploadedSuccessfully() {
    if (number.value > 0 && uploadList.value.length === number.value) {
      fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value)
      uploadList.value = []
      number.value = 0
      emit('update:modelValue', listToString(fileList.value))
      proxy.$modal.closeLoading()
    }
  }

  // 上传失败
  function handleUploadError() {
    proxy.$modal.msgError('上传图片失败')
    proxy.$modal.closeLoading()
  }

  // 预览
  function handlePictureCardPreview(file) {
    // console.log('预览file', file)
    // let str = file.url.slice(8)
    // console.log('str', str)

    dialogImageUrl.value = file.url
    dialogVisible.value = true
  }

  // 对象转成指定字符串分隔
  function listToString(list, separator) {
    let strs = ''
    separator = separator || ','
    for (let i in list) {
      if (undefined !== list[i].url && list[i].url.indexOf('blob:') !== 0) {
        strs += list[i].url.replace(baseUrl, '') + separator
      }
    }
    return strs != '' ? strs.substr(0, strs.length - 1) : ''
  }
</script>

<style scoped lang="scss">
  // .el-upload--picture-card 控制加号部分
  :deep(.hide .el-upload--picture-card) {
    display: none;
  }
</style>
